body {
  margin: 45px;
}
#quiz {
  width: 60%;
  min-width: 300px;
  max-width: 800px;
  margin: 0 auto;
  padding: 10px;
  text-align: center;
}
.quiz-settings {
  text-align: center;
}
.quiz-choice {
  width: 200px;
  height: 40px;
  display: block;
  margin: 8px auto;
}
.quiz-stat {
  position: fixed;
  left: 10px;
  bottom: 10px;
}
.quiz-message {
  width: 200px;
  margin: 12px auto;
  padding: 5px 0;
  border-radius: 3px;
  opacity: 0;
}
.quiz-message.wrong {
  opacity: 1;
  color: #a33;
  background: #e99;
  border: 1px solid #a33;
}
.quiz-stat-wrap {
  overflow: auto;
  height: 100%;
}
.quiz-stat-list {
  list-style: none;
  padding: 0 5px;
}
.quiz-stat-list > li {
  font-size: 14px;
  line-height: 2em;
}
.quiz-stat-list > li + li {
  border-top: 1px solid #ddd;
}

.btn {
  padding: 5px 15px;
  text-decoration: none;
  color: #333;
  background: #fefefe;
  border-radius: 3px;
  border: none;
  opacity: 0.9;
}
.btn:hover {
  opacity: 1;
}
